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what are the user defined functions in SQL Server

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DBA Trainer

User Defined Functions play an important role in SQL Server. User Defined functions can be used to perform a complex logic, can accept parameters and return data. Many a times we have to write complex logic which cannot be written using a single query. SQL Server supports two types of User Defined... read more
User Defined Functions play an important role in SQL Server. User Defined functions can be used to perform a complex logic, can accept parameters and return data. Many a times we have to write complex logic which cannot be written using a single query. SQL Server supports two types of User Defined Functions as mentioned below – - Scalar Functions – The function which returns a Scalar/Single value. - Table Valued Functions – The function which returns a row set of SQL server Table datatype. Table Valued Functions can be written as – 1-->Inline Table 2-->Multi-statement Table read less
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To write/implement custom code. An example: you can send FlightNumber and date in the parameter and return number of seats available.
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Expert in Education

1. Scalar Function 2. Table-Valued Functions 3. System Functions
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Coaching

Like functions in programming languages, SQL Server user-defined functions are routines that accept parameters, perform an action, such as a complex calculation, and return the result of that action as a value. The return value can either be a single scalar value or a result set. You can create the... read more
Like functions in programming languages, SQL Server user-defined functions are routines that accept parameters, perform an action, such as a complex calculation, and return the result of that action as a value. The return value can either be a single scalar value or a result set. You can create the function once, store it in the database, and call it any number of times in your program. User-defined functions can be modified independently of the program source code. Similar to stored procedures, Transact-SQL user-defined functions reduce the compilation cost of Transact-SQL code by caching the plans and reusing them for repeated executions. This means the user-defined function does not need to be reparsed and reoptimized with each use resulting in much faster execution times. read less
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A 4.2 years experienced Dotnet developer, worked with IT giants, ample hands on experience.

User Defined Functions or UDFs as they are fondly called are functions which you/user creates in SQL server. It may be scalar function, a table valued function etc. Select statements can be used in UDFs and not Insert/Update/Deletes. There won't be any try catch block inside a UDF. But you can use a... read more
User Defined Functions or UDFs as they are fondly called are functions which you/user creates in SQL server. It may be scalar function, a table valued function etc. Select statements can be used in UDFs and not Insert/Update/Deletes. There won't be any try catch block inside a UDF. But you can use a UDF in a select statement as well.For ex: select * from dbo.myFunction. read less
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Software Trainer

Like functions in programming languages, SQL Server user-defined functions are routines that accept parameters, perform an action, such as a complex calculation, and return the result of that action as a value. The return value can either be a single scalar value or a result set.
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Trainer

These are the methods in sql which returns the value.Example is below CREATE FUNCTION Test(@param1 Varchar(20)) RETURNS VARCHAR(200) AS BEGIN ---your TSQL code .... .... Return somevalue END Above is the function Test which takes parameter param1 and return string value you can call... read more
These are the methods in sql which returns the value.Example is below CREATE FUNCTION Test(@param1 Varchar(20)) RETURNS VARCHAR(200) AS BEGIN ---your TSQL code .... .... Return somevalue END Above is the function Test which takes parameter param1 and return string value you can call these functions with the help of sql statement SELECT dbo.Test('somevalue') read less
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MTech

Like functions in programming languages, SQL Server user-defined functions are routines that accept parameters, perform an action, such as a complex calculation, and return the result of that action as a value. The return value can either be a single scalar value or a result set.
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Tech Lead, 7+ exp in working with .NET, SQL

UDF in SQL are similar to Stored Procedures but unlike Stored Procedures, UDF can only perform SELECT operations. UDF are basically of 2 types, i.e: Scalar UDF & Tabular UDF Scalar UDF: Returns a single value. Either any column value from a table OR any arithmatic calculus Example: 1.) Based... read more
UDF in SQL are similar to Stored Procedures but unlike Stored Procedures, UDF can only perform SELECT operations. UDF are basically of 2 types, i.e: Scalar UDF & Tabular UDF Scalar UDF: Returns a single value. Either any column value from a table OR any arithmatic calculus Example: 1.) Based on Employee ID, return Employee Name / Salary / Address. 2.) Based on Employee ID, calculate and return Employee remaining leaves. Tabular UDF: Returns the tabular data. Example: 1.) Based on Employee ID, return all details about an employee in tabular format. Note: Using UDF, you cannot perform any Insert/Update operation on any database Table. You can fetch data from any database Table read less
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Tutor

user defined functions are used to store set of SQl statements which are already complied but it has limited scope as compared to Stored Procedure.These are either be scalar functions(used to return single value) or table Valued functions(used to return data in form of table).
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